lkml.org 
[lkml]   [2018]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] x86/intel: introduce platform_id
Date
Platform ID retrieved from MSR_IA32_PLATFORM_ID may be used as
a filtration condition in some cases.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
---
arch/x86/include/asm/processor.h | 1 +
arch/x86/kernel/cpu/intel.c | 7 +++++++
2 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index d3a67fb..c0b4d47 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -133,6 +133,7 @@ struct cpuinfo_x86 {
u16 cpu_index;
u32 microcode;
unsigned initialized : 1;
+ u8 platform_id;
} __randomize_layout;

struct cpuid_regs {
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index b1af220..cee0554 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -229,6 +229,13 @@ static void early_init_intel(struct cpuinfo_x86 *c)
}

check_mpx_erratum(c);
+
+ if ((c->x86 > 6) || (c->x86_model >= 5)) {
+ u32 val[2];
+
+ rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
+ c->platform_id = 1 << ((val[1] >> 18) & 7);
+ }
}

#ifdef CONFIG_X86_32
--
1.8.3.1
\
 
 \ /
  Last update: 2018-01-15 06:44    [W:0.098 / U:89.428 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site